Carburetor



G. E. FLEMING CARBURETOR Dec. 11 1923.

Filed Oct. 25 1920 2 Sheets-Sheet 1 a INVENTOR.

6212075 E Zia/111% ec. 11, W23. mama Q. E. FLEMNG GARBURETOR Filed Oct.25, 1920 ZSheets-Sheei 2 M V I N VEN TOR.

i A TTORNEY.

Patented Dec. 11, 1923.

. 1 1,476,701 OFFICE;

.CIJAUDE E. FLEMING, OF DETROIT, MICHIGAN.

CARBURETOR.

Applieation filed October 25,1920. Serial No. 419,261.

To all whom it may concern:

Be it known that I, CLAUDE E. FLEMING, a citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Carburetors, of whichthe following is a specification.

This invention relates to carburetors, and

has for'its object a. carburetor provided with an automatic regulationfor the 'auxilia air and also a manual control for the auxi iary air. Aspecial form of float and needle valve is utilized.

One of the novel features of the 'carburetor is the arrangement of afiber or felt,

wick through which a regulatable quantity of air is drawn to vaporizethe fuel oil, as

will be more fully explained hereafter.

In the drawings,- V Fig. 1 is a side elevation of the carburetor showinga part of the throttle chamber in section.

Fig. 2 is an elevation of the carburetor taken ninety degrees removedfrom Fig. 1

and showing the lower portion of the carburetor in vertical section.

Fig. 3 is a section on the line 3-3 of F ig 2.

ig. a is a section on the line 4-4; of 30 Fig. 2.

ig. 5 is an enlarged section of the lower portion of the carburetorshowing how more air is admitted by pulling the draft rod.

Fig. 6 is a section on the line 6-6 of The carburetor is of simpleconstruction, comprising simplv ajflfloat chamber a. formed by a castingupon which is mounted, by screwing thereto, a cylinder 1) which carriesthe auxiliary air intake and the control for the same, which will bepresently described. The casting a; is provided with'a depending boss aforming a nozzle socket. The cap ii that closes the lower end of thecasting is provided with a projecting boss or air tube 6. This hassubstantially the same configuration as the socket in the boss 0. A wickf of fibrous material, such as loose felt, is adapted to fit over theair tube (2 and engage in the space between the air tube and the socketin the boss. This wick is adapted Ito-raise the fuel oil contained inthe float shaft 3 that carries the throttle valve is jourcontinuationwill be designated the throttle I This wick is. sufficiently porous toallow the passage o f airtherethrough, which is introduced by the airtube e and which is provided with .a. relatively large central bore 9communicat ing with an air valve chamber h and in. which is arranged theair valve 6 which is; never completely closed. Aspring j engages"between this air valve and the screw plug la. This screw plu is providedwith air orifices Z.- A pair 0 lugs or arms we depend from this screwplug and are adapted to'" hold the pin n on which the cam o is pivoted;This cam' 0 has a draft connection p that may be led to any convenientpoint as on' the dash of the car. The bottomof the cam v o engages withthe cam, follower that is) perforated and screw-threaded to i'eceivethethreaded valve stem r. The jam-nut a is also threaded, onto this stem.The member g-is adjustable on the stem I The float is a cork rin t whichenga about the bossc and which is secured willevfioat arm u by means ofthe continuation oi r to the boss onan arc whose center is at y.

This construction eliminates the usua-Pw counterweighted arms used onfloats to" con vert the rising movement of the float/into the descendingmovement of the needle valve; and the drop of the float intorising'movei,. ment of the needle valve' These counter weight levers arenot only more expensive 'g construction but they'often result in troubledue to cramping on their bearings and sticking. I find that an obliquefloat, as shown, works much better as it travels u on'an are.

The throttle valve is designa '2 and-the naled in a continuation of thecylinder-b that forms the auxiliary air intake. .aThis 106 valve housingand is lettered 4. The arm 5 is attached to the throttle valve shaft-andI may beconne'cted by the usual draft rod to the throttle lever on thesteering post, Or the arm.30 may optionally be connected with 110 thethrottle lever on'fifthe steering post; A' stub 6 on the memberfjbearingarm 5 is adapt- 5 cylinder '1). Obviously the rotating less of thisauxiliary air intake adjusted slightly up I to the other end by reasonof the slots 21 air at any throttle valve,

' tube andthe boss.

ed to be engaged by the point 7 of the adjusting MKQW 8 to adjust theidling speed oi the motor at closed throttle. NOthln is claimed forthese throttle connections. fiowever, on

L the other end of the throttle shaft is secured an arm 9 which connectsthrou h aiball and socket/joint 10 with a rod 11 t at asoconnectsthrough a ball and socket joint 12 with the revolving sleeve or shutter13 that rotates on the exterior of the cylinder b. 14: designates ascreen that is secured 1n the opening of the cylinder b and that guardsthe auxiliary air intake. The auxiliary air intake is a rectilinearopening'through the sleeve 13 more or epending upon the throttleposition. When the throttle is opened up wide this entire auxiliary airintake is automatically opened by reason of the ball and socket and rodconl'lBLtlOl'lS 10, 11 and 12.

fifmanual control for'the auxilia air intake is afforded by the curtain16 w constitutes a shutter for uncoverin 'with'the screw studs 19provided with hea s at 20. The curtain may be adjusted simultaneously atboth ends or one end may be ordown with respect permitting; a certaintilting. Obviously this regulates to a given throttle opening. The

as already explained, automatically opens up the auxiliary air intake inaccordance with the throttle opening.

in starting the draft rod 29 is pulled, causing the rotation of the camo to depress the cam follower g which carries the air valve downwardly,enlarging the air intake to allow a great amount of air to be drawn oftaking through the wick for the purpose uel oil fed by up a greateramount of the the wick.

' The valve stem 1' by loosenin the jamnut a may be adjusted through t efollower g to alter theamount of air entering through V the air tube 6.

The operation of the carburetor as regards the enrichingof the'mixtureby enlarging the amount of air passing through the wick is as follows:

The wick is packed 'in between the air If it werent packed in this wayand the suction were strong enough the raw fuel would be drawn up'insucquantities'as to make the construction impossible. i Itwouldoperate in the same way a needle valve carburetor operates, exceptthe quantities of fuel would be very large. "With the wick packed inbetween the air tube and the boss socket only fuel oil fed up bycapillary action is available. This fuel is ich is a' thin sheet'metalmember that can be adnicety the amount of auxiliary tamper picked up byair passing through the wick. Now if a small quantity of air passesthrough; the wick the saturation of the wick may be greater than thatquantity of air can handle, but with a larger quantity of air, the airmay pick the fuel up as fast as capillary action will feed it up intothe top of the wick. Nowthis is the critical point and a furtheradmission Oll' air through the air tube would simply dilute the mixture.Only -a small quantity of air, compared to the total amount of air goesthrough the air tube, in fact by screwing up theair regulating valve,

it is possible to make the air for ordinary running a very smallproportion of the total amount of air. Consequently if the wick is largeenough it will feedmore fuel oil than that small quantity of air cantake up, hence an enlargement of the cross section of the air columnwill, within given limits produce a richer mixture. The limit can efixed by the shape of the cam.

What i claim is:

1. In a carburetor, the combination of a casin divided into a mixingchamber and a fuel reservoir connected by a passageway, a wickcompletely filling parts of said passageway so as to choke the same andpre vent passagev of fuel except that fedthro'ugh the wick, said casingprovided with a port for delivering air directly into the mixin chamber,and with a tube of relatively sma air delivery capacity compared withsaid port for delivering air to. the wick so as to cause the same topass through the wick beforeentering the mixing (chamber, and means forregulating the amount of, air admitted to the air tube to enrich themixture directly as the amount is increased up to the critical point, atwhich time all of the fuel fed up the wick is taken up by the air,completely saturating thesame.

2. In a carburetor, the combination of a casin divided into a mixing.chamber and a fuel reservoir connected bya passageway,

- the casing provided with a pbrt for admitwhich may. be also diagonallytipped to vary the port opening from side" to side, and a rotary shutteroperating in adirection substantially '90 degrees removed from themovement o the curtain in; adjustment,

the said shutter provided with connections by which it can be caused toautomatically move with the throttle movement.

'3. in acarburetor, the combination-of a casing divided into a mixingchamber and a fuel reservoir connected by a passageway,

awick completely filling partsof saidgpassageway so as to choke the sameand prevent passage of fuel except that fed through the wick, saidcasing provided with a port for delivering the air directly into the v n/acct mixing chamber and with a tube of relatively small air deliveringcapacity for deliverlng air to the wick so as to cause the same to passthrough the wick before entering the mixing chamber, and means for regulating the amount of air admitted to the air tube under normal runningconditions including devices for permitting an unusually large amount ofair to enter the tube for starting said devices permitting the parts toreturn to the normal position of adjustment for runnin after starting.

4. In a carburetor, t e combination of a casing divided into a mixingchamber and fuel reservoir connected by a passageway the'said casingbeing provided with a downwardly depending boss provided with a socketand with an upwardly extending air tube adapted to fit into the socketof the boss and a wick packed in between the interior of the boss andthe exterior of the air tube, said casing provided with a port fordelivering air directly into the mixing chamber and the said air tubedelivering a small amount of air through the wick packed between thetube and the boss and means'for regulating the amount of air ad- 7mitted to the air tube.

In testimony whereof I afiix my signature.

CLAUDE E. FLEMING.

